Syntheses and characterizations of two lanthanide(III)-copper(II) coordination polymers constructed by pyridine-2,6-dicarboxylic acid

Reaction of La2O3 and Pr2O3 with pyridine-2,6-dicarboxylic acid (H2pydc), CuO and H2O with a mole ratio of 1:2:4:300 resulted in the formation of two polymeric Cu(II)-Ln(III) complexes 1 and 2 with one-dimensional infinite “∞” shape chains, which are assembled into two-dimensional layer and an open three-dimensional network with nanoscale porosities by various weak intermolecular forces involving O-H⋯O hydrogen bonds and π⋯π stacking interactions. Temperature-dependent magnetic susceptibilities and the thermal stabilities of complexes 1 and 2 were examined.